1 package org.opentrafficsim.road.gtu.lane.tactical.following;
2
3 import org.djunits.unit.AccelerationUnit;
4 import org.djunits.value.vdouble.scalar.Acceleration;
5 import org.djunits.value.vdouble.scalar.Length;
6 import org.djunits.value.vdouble.scalar.Speed;
7 import org.opentrafficsim.base.parameters.ParameterException;
8 import org.opentrafficsim.base.parameters.Parameters;
9 import org.opentrafficsim.road.gtu.lane.perception.PerceptionIterable;
10 import org.opentrafficsim.road.gtu.lane.perception.headway.Headway;
11
12 /**
13 * Implementation of the IDM+. See Schakel, W.J., Knoop, V.L., and Van Arem, B. (2012),
14 * <a href="http://victorknoop.eu/research/papers/TRB2012_LMRS_reviewed.pdf">LMRS: Integrated Lane Change Model with Relaxation
15 * and Synchronization</a>, Transportation Research Records: Journal of the Transportation Research Board, No. 2316, pp. 47-57.
16 * Note in the official versions of TRB and TRR some errors appeared due to the typesetting of the papers (not in the preprint
17 * provided here). A list of errata for the official versions is found
18 * <a href="http://victorknoop.eu/research/papers/Erratum_LMRS.pdf">here</a>.
19 * <p>
20 * Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
21 * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
22 * </p>
23 * $LastChangedDate: 2015-07-24 02:58:59 +0200 (Fri, 24 Jul 2015) $, @version $Revision: 1147 $, by $Author: averbraeck $,
24 * initial version 5 apr. 2016 <br>
25 * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
26 */
27 public class IDMPlus extends AbstractIDM
28 {
29
30 /**
31 * Default constructor using default models for desired headway and desired speed.
32 */
33 public IDMPlus()
34 {
35 super(HEADWAY, DESIRED_SPEED);
36 }
37
38 /**
39 * Constructor with modular models for desired headway and desired speed.
40 * @param desiredHeadwayModel DesiredHeadwayModel; desired headway model
41 * @param desiredSpeedModel DesiredSpeedModel; desired speed model
42 */
43 public IDMPlus(final DesiredHeadwayModel desiredHeadwayModel, final DesiredSpeedModel desiredSpeedModel)
44 {
45 super(desiredHeadwayModel, desiredSpeedModel);
46 }
47
48 /** {@inheritDoc} */
49 @Override
50 public final String getName()
51 {
52 return "IDM+";
53 }
54
55 /** {@inheritDoc} */
56 @Override
57 public final String getLongName()
58 {
59 return "Intelligent Driver Model+";
60 }
61
62 /** {@inheritDoc} */
63 @Override
64 protected final Acceleration combineInteractionTerm(final Acceleration aFree, final Parameters parameters,
65 final Speed speed, final Speed desiredSpeed, final Length desiredHeadway,
66 final PerceptionIterable<? extends Headway> leaders) throws ParameterException
67 {
68 Acceleration a = parameters.getParameter(A);
69 Headway leader = leaders.first();
70 double sRatio =
71 dynamicDesiredHeadway(parameters, speed, desiredHeadway, leader.getSpeed()).si / leader.getDistance().si;
72 double aInt = a.si * (1 - sRatio * sRatio);
73 return new Acceleration(aInt < aFree.si ? aInt : aFree.si, AccelerationUnit.SI);
74 }
75
76 }